Open any — yes, any — Office 2016 application. Under File > Account, look for Office Theme and select Dark Gray from the dropdown menu. You should now see the new theme across all your Office apps on every computer connected to the current account.
If that doesn’t work, or if you don’t want the setting tied to your account, there’s an alternative method.
Navigate to File > Options > General and switch to the Dark Gray theme via Office Theme, which you’ll find under Personalize your copy of Microsoft Office. Remember to click on OK to finalize the change.
Again, keep in mind that unlike the first method, the second method swaps out the theme only in Office apps on the computer you’re using to make the change.
I am very happy that Microsoft designers now understand what Dark Grey should look like in an Office theme. #Office2016
— Mike Ferrara (@mikecferrara) October 15, 2015
Do you prefer dark themes over light ones? Or are you okay with either and prefer to stick with the default theme all the time? We’re curious to find out!